James a



(No Model.) 7

J. A. LIGHTHIPE.

ARC LAMP.

No. 408,887. Patented Aug. 13, 1889.

WITNESSES:

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I BY

N. PETERS Photoiilhngmphur. \vuhin mn, D. c.

UNITED STATES PATENT OFFICE.

JAMES A. LIGHTHIPE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIMSELF, GEORGE \Y. BRATTON, OE SAME PLACE, AND HENRY NUNEZ,

OF NE YORK, N. Y.

ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 408,887, dated August 13, 1889.

' Application filed June 19, 1888. Serial No. 277,565. (No model.)

To all whom it may concern.-

Be it known that 1, JAMES A. LIGHTHIPE, a citizen of the United States, residing in the city and county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Regulators for Electric- Are Lamps, of which the following; is a specification.

My invention relates to improvements in arc-light regulators of that type in which the upper carbon is fed forward by gravity and its descent is governed by a rack and pinion controlled electro-magnetically. Its objects are, first, to provide such a regulator as will be steady and regular in thefeed of the carbon; second, to provide a novel form of electro-magnetic cut-out for automatically cutting the lamp out of circuit in the event of any abnormal separation of the carbons or accident to the feeding-gear. l accomplish these objects by the mechanism hereinafter described, but particularly pointed out in the claims which follow this specification.

Referring to the drawings for a full understanding of my invention, Figure 1 represents a side elevation of my improved regulator, showing the feed-regulatin g magnetin broken section; and Fig. 2 represents an end elevation of the apparatus.

T is the carbon-sustaining rod, guided in the usual manner through the frame and provided with a rack S.

G is a tilting feeding-frame pivoted at E F on the side of the lamp-frame. This tilting frame carries one or more armatures H H, located below the polar extensions D D of magnet C, and also two revolving shafts L M, the former of which is held in place by adjustable screws J J and the latter by screws K K.

On the shaft L is a faradic disk N of magnetic material, which is adapted to rotate between the lateral faces of the magnets polcpieces D D. The disk and shaft are geared through pinion P and cog-wheel Q to the second shaft M, which carries also a second pinion R, meshing with a rack S of the carboncarrier T. The cog-wheel Q is loose on shaft M, and is connected by a spiral spring on with the tilting frame G. Said cog-wheel carries a pawl 19, which takes in a ratchet XV, fixed to the shaft M.

U is an ad j LlStlllg-SPllllfI connected with the free end of the tilting frame at one end and at its other end to a bell-crank lever V,

pivoted to the frame and having an ad justing-screw IV for regulating its stress, and hence the length of the are.

The regulating-magnet C is pivoted to a block of metal B, fixed to the top of the lampframe, thereby guaranteeing equal action on the part of the pole-pieces D D and faradic disk N. The coarse wire X, wound directly about the core of the magnet O, is connected atone end to the plus binding-post Y, which is insulated from the frame, the other end thereof being connected to the upper-carbon holder in the usual way, making a passage for the current through the upper carbon, thence to the lower carbon, finally to the frame, and by the standard S and wire 25 to the minus binding-post Y.

Z is a fine wire of high resistance differentially wound, in a manner well understood, about the coarse wire X on magnet 0, connected at one end to binding-post Y and at the other to the fine-wire coil B, joined to the cut-out apparatus and the binding-post Y, being in the nature of a high-resistance shunt around the lamp, the function of which is well understood by those skilled in the art. The coil B, already described as being in the derived circuit and of high-resistance wire, is fixed to the frame by arms or standards 0 C, which latter also carry 011 a rod joining them a pivoted armature D, having an adjustable weight F on its lower end E, as well as a me tallie or conducting arm G, adapted when drawn up under action of the magnet 13 and armature D to close a local or shunt circuit about the lamp from the plus binding-post Y by wire 0 through standard C, lever G, spring L, wire U, low-resistance magnet J, through the negative binding-post Y. This energizes both armatures M and causes them to firmly grip the lever G between the springs L L making a ii rm electrical eontatt through the shoulder N of spring L and with le- Vcr G.

The operation of this cut-out is at once obvious and needs no further description here.

The operation of the lamp is as follows: The current passing from the plus bindingpostY through magnet G, carbon-carrier T, and upper and lower carbons (latter not shown) to and through standard S by wire f to the negative binding-post Y causes the armatures ll ll to lift the tilting frame G, and with :it the pinion R, as well as the carbon-carrier '1, thereby establishing the are between the carbons, and also magnetizing the iarai'lic disk N in such manner as to prevent its rotation. As the pinion Ris raised the carboncarrier T is lifted, the spiral. springmhaving been. put under stress through pawl and ratchet TV when the carbon-carrier 'l was inserted. This gives a delicate and sensitive adjustment of the carboir'feeding apparatus and prevents sudden and irregular jerks due to most gravity feeding devices. The spring 7H aids graa'ity in feeding the carrier ili'orward. As the are becomes abnormal the current passes into the derived circuit 71 in a manner well, understood, and the magnet becomes less energetic, thus allowing the iiaradic disk N to rotate under stress of the carbon-carrier and spring in, thereby permitting the carbon to descend until a normal.current is again attained in the arc circuit, when the frame is again drawn up. \Yhen the upper carbon is iirst inserted in the lamp and the rack placed at its uppermost position, the spring m is undcr the strongest tension tending to aid gravity in forcing the carrier forward; but this iu-- lluenee is always counteracted by the action of the 'li'aradie disk N acting through the train of gear as long as the arc is normal.

I am aware that it is old inv the art to provide gravity-feed arc lamps with tilting frames carrying a train of gear and a pinion which meshes with a rack on the carbon-carrier, by which the are is established and regulated through the agency of a dillierentiallywound magnet or magnets; and I do not therel'ore claim, broadly,such a construetion.

I am also aware that it is old to provide an arc lamp with an au'ton'u'itic electro-magnetie cut-out which aes through the derived. eircuit to close a circuit: of low resistance about the lamp and through a low-resistrnice electro-magnet which holds said lowresistance shunt-circuit permanently closed as long as the current flows, and. I do not therefore claim, broadly, this feature.

I am. also aware that it is not novel with me to regulate the feed of the electrmles in an arc lamp through the ageneyol' a i''tradic disk operatively ctmneeted to a train oi gearing and the electrode or electrodes, and l make no claim to the application off this generic principle; but

ll'hatl do claim, and desire to secure l Letters Patent ol. the United States, is

1. An arc-light regulator having a carbrmcarrier geared to a train of gearing attached to a pivoted lrame carrying a rotating armature located in the magnetic lield ot a pivoted regulating electro-inagnet, between the poles of which the rotating armature rotates, in combination with Iixed. arlnatures carried also by the Frame and lying in the magnetic .[iehl oi. the regulaiing-magnet, suliisiz'mtially as described.

2. An arc-lightregulatorconsisting of a earhon-carrier geared to a train of gearing carried on a pivot 3d frame, and also to a rotz'ttingarmature located in the magnetic field olf a regulating eleetro-magnct, with a tixed ar1na ture also attached to said frame and located in the magnetic field for establishing theare, substantially as described.

3. ln an are-light regulator, the combination oi. a pivoted lj'rame carrying a train ol' gear geared to a rack on the earbmi-earrying rod,and a rotating armature located between the poles of a regulating-magnet, with a fixed armature attached to said frame, whereby the arc is established and regulated, sub sian'tially as described.

JAMES A. 'I'JIHH'IIIIIIC.

Witnesses:

.louN A. W1nnnnsnnnn, (ni.\s. ll. Hnrrn. 

